Mbh 7.172.2

“Sanjaya continued, ‘Then that vast force of Yudhishthira once more returned to battle, proceeding to the place where Drona and Karna were grinding their foes in battle. At dead of night, a fierce encounter took place, resembling that of two oceans swelling at moon-rise. Then the warriors of thy army, throwing away from their hands the blazing lamps held by them, fought with the Pandavas fearlessly and madly. On that terrible night when the world was enveloped with gloom and dust, the combatants fought with one another, guided only by the names they uttered. The names uttered by the kings contending in battle, were heard, O monarch, there, like what happens, O king, at a Swayamvara or self-choice. Suddenly, a silence overspread the field of battle, and lasted for a moment. Then, again, a loud uproar was heard made by the angry combatants, victors and vanquished. Thither where blazing lamps were seen, O bull of Kuru’s race, thither rushed those heroes like insects (towards a blazing fire). And as the Pandavas, O king, and the Kauravas, contended with each other in battle, the darkness of night thickened around them.’”